Cylinder Rescue

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Way too many cylinder wind up getting pulled due to low compression, says Mike Busch A&P/IA. Many of them can be rescued without resorting to cylinder removal. Mike illustrates this by telling the story of a frustrated Piper Seneca owner who had already replaced seven cylinders and was now being told by his mechanic that two more needed to be replaced. With the help of Mike's team, both cylinders were rescued without removal--one by lapping the valve in place and the other by doing a solvent ring flush. Mike feels that cylinder removal should be the last resort after these less-invasive methods have been tried. Savvy Aviation offers Professional Maintenance Services to owners of General Aviation aircraft, such as: SavvyMx (Professional Maintenance Management), SavvyQA (Expert Consulting), SavvyPrebuy, SavvyAnalysis (Engine Data Analysis) and Breakdown Assistance. Savvy also publishes a monthly newsletter with lots of interesting information for the general aviation enthusiast; subscribe to it at www.savvyaviation.com or text the word "Savvy" to 33777. This webinar was hosted by the Experimental Aircraft Association (EAA).

Опубликовано:

13 фев 2022

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Комментарии : 37

@colinmomberger1065 2 года назад

I learned this technique from you eight years ago at Oshkosh. I have used it to rescue several cylinders for clients and have saved them thousands of dollars, as well as teach this to my A&P students and Repairmen at our Jetstream Aero Inc. A SAVVY Aviation G.A. AAA Repair Station in San Bernardino, Ca. Thanks again Mike!

@Lehmerable Год назад

Mike, I can not tell you how much your publications have helped me as a professional aircraft mechanic. Its frustrating to me that so many mechanics stress about lower than 70/80 compression numbers on Continentals and without using a borescope or understanding the master orifice, immediately jump to overhauling the cylinder. It ends up costing the customer a lot of money and wastes the mechanics time. One thing I would add, I found that you don't need to drop the exhaust to access the valve during a valve lapping procedure. If you use the tip of a zip tie, you can maneuver it with compound through the top spark plug hole.

@edwardallan197

I love the minute details interwoven with guiding ideas. I am learning a LOT. Thank you!

@apfelsnutz 2 года назад

Thanks Mike, I'm replacing the rotor coils on my Navion E-225 this annual...

@MayhemCanuck 2 года назад

As an Automotive tech doing compression test is nothing new. But its interesting, as what you call a compression test we call a cylinder leak-down test, witch we do after the compression test if we have a noticeably low cylinder compared to the others. Cylinder low compared to others, Leak-down test at TDC and see where the air leakage is then a bore scope check, witch we have been doing for a long time since camera prices came down. I think I'm buying a VA-400, it will be a great tool to look up into the cylinder as the one I have only looks down or 90 degrees. Its nice to show the client/customer actually whats wrong.

@usmcmech96 2 года назад

Back when the original FARs were written, compression was the best diagnostic tool they had. Today we have a much better idea of what's going on inside of the engine.

@jimrankin2583 2 года назад

The old hand spindles with the suction cup on the end that were used to use to lap valves when the head is off an engine required you to reverse the direction of rotation. I doubt it’s important to do that but it was how the procedure used to be accomplished.

@dougm2745 2 года назад

Learn so much from watching these. Thanks!

@jimrankin2583 2 года назад

rope trick is best done with nylon braided rope that won’t leave debris in the cylinder. It’s softer and confirms to the space better than poly or sisal fiber rope.

@apfelsnutz 2 года назад

Looking forward to this one...

@briand3837 2 года назад

I remember staking the exhaust valve as a means to get rid of any carbon buildup that might be keeping the valve from fully closing.

@apfelsnutz 2 года назад

MMO and Lacquer Thinner works like perfect

@rickseeman5679 Год назад

I love this guy

@FlyingNDriving 2 года назад

So if you have a high use of mogas, a cylinder flush shouldnt be that sludged up since most of the sludge is from lead from 100LL?

@BonanzaPilot 2 года назад

what would it take to get Mike a good mic?

@l19birdog 2 года назад

I have a 10 over cylinder with 200 hrs on since rebuild. It has a loose valve guide. The local shop could not repair it and recommended a another shop that might could install a 30 over guide.

@apfelsnutz 2 года назад

Make sure you wait a while before you do the second flush. I did this on a Darter 100 that had set for 16yrs. in a very hot "hangar" in the middle of the desert... no problems.

@marklandry2509 2 года назад

Is it feasible regarding the worn cylinder to pull it, replace the rings and re-hone it similar to what is commonly done to outboard motors that lose compression.

@derekevans7829 2 года назад

Hey Mike, I am Savvy Pro user, and I have a question in regards to the cylinder wash. I live in California, and I cannot acquire Xylene and "real" mineral spirits. Will the substitute products at my local Home Depot/Lowes be sufficient? Thanks!